Engine Miss firing

[94stangfan]

All,

I had an oil pump go on my engine, so I bought a used one from a junk yard. The engine looks rebuilt.

After installing and starting, I found I have a miss-fire on Cyl 3. Does anyone have any idea what would cause this?

Thanks,

Keith

 

[94stangfan]

One thing I forgot to mention is that I do have the Check Engine Light on. I read the code and it is a P0303. Which says Cyl 3 is misfiring.

 

[dastang2]

try switching a known good spark plug in 3 and see what happens. do a compression test too.

 

[94stangfan]

It was an ID10T Error... I had to replace my fuel rails when putting the new engine in. I must have accidently unplugged that injector. That was my problem.

Problem Solved....

Thanks,

Keith